Draggable: Don't cache parent offset if the parent position is fixed. Fixes #5009 - Draggable: scroll not working with parent's position fixed
Datepicker: Fixed date format for Serbian locales. Fixes #7347 - Datepicker: Wrong date format for Serbian localization.
Datepicker: Remove unnecessary global variable now that we don't use inline event handlers anymore.
Datepicker: Remove unused _getBorders() method.